X-ray diffuse scattering study on charge-localized states of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">MnO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn /><mml:mo>(</mml:mo><mml:mi>x</mml:mi><mml:mo>=</mml:mo><mml:mn>0.35</mml:mn><mml:mo>,</mml:mo><mml:mn>0.4</mml:mn><mml:mo>,</mml:mo><mml:mn>0.5</mml:mn><mml:mn /><mml:mo>)</mml:mo><mml:mn /></mml:math>

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Description

X-ray scattering measurements on ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ $(x=0.35,0.40,0.50)$ have revealed the existence of diffuse scattering above the charge and orbital ordering transition temperature ${(T}_{\mathrm{CO}}).$ The diffuse scattering has local intensity maxima at incommensurate positions $(0,\ifmmode\pm\else\textpm\fi{}\ensuremath{\zeta},0).$ With decreasing temperature, $\ensuremath{\zeta}$ increases from about 0.4, and it discontinuously changes to 0.5 at ${T}_{\mathrm{CO}}.$ Characteristic patterns of diffuse intensity distributions can be qualitatively interpreted by calculations based on distortion fields associated with the Jahn-Teller effect. The observed patterns are similar to those observed above the ferromagnetic insulator-metal transition temperature in $({\mathrm{Nd}}_{0.125}{\mathrm{Sm}}_{0.875}{)}_{0.52}{\mathrm{Sr}}_{0.48}{\mathrm{MnO}}_{3}$ reported previously.

Journal

  • Physical Review B

    Physical Review B 62 (6), 3875-3878, 2000-08-01

    American Physical Society (APS)

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